Police were targeting speeding drivers in St Albans along a road that some have been using as a "race track".
Officers patrolled Redbourn Road on Thursday to tackle fears over speeding along the stretch.
Over 500 cars used the road between 9.30am and 11.30am, with eight cars travelling between 35 to 40mph in the 30mph limit.
Officers then moved into the 40mph limit section of the road where they spoke to five drivers who were exceeding the speed limit.
Harpenden Neighbourhood Sergeant Mark Essam said: “Unfortunately, some drivers have been using this road as a race track which increases the chances of road traffic collisions and puts other road users in danger."
He added that the public has also alerted police to similar problems on Marford Road, Station Road, Lower Luton Road, Roundwood Lane, Brewhouse Hill and The Hill.
He said: “Due to the wet driving conditions, drivers seemed to be more cautious yesterday, however we did speak to a few drivers who were exceeding the 30mph and 40mph limits and we gave them strong words of advice.
"If any of them had been excessively speeding, we would have issued fines and in extreme cases, some may have been summonsed directly to court.
"We will continue speeding operations in the areas identified, so to make sure you are not caught out, obey the speed limit - it is there for a reason.”
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